book Maths Puzzle Numerical Ability

x+6/x+3 - 2 = 3/x+3

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book Other Question

Hello, I need help I was told to simplify.
5 sqrt 12+6 sqrt 1/3 - 3 sqrt 48
Thank you
Can someone show me how to simplify these 2 problems--please show me the steps

(2x)^2 * (3x^4)

and

(-3x divided by 2y^3)^-2